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-rw-r--r--DOCS/man/options.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index 2327817976..976e02a2e6 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -2318,6 +2318,9 @@ Input
get replies or events. Use ``--input-unix-socket`` for something
bi-directional. On MS Windows, JSON commands are not available.
+ This can also specify a direct file descriptor with ``fd://N`` (UNIX only).
+ In this case, JSON replies will be written if the FD is writable.
+
See also ``--slave-broken``.
.. note::